Lost password Endpoint & shortcode not working

I understand that the lost password is like a sub page in “My account page”. I add the “Lost user password” page template as parent in “My account page”. But when i want to view the page with the url :

http://localhost/theme/my-account/lost-password/ not show me, show me the “My account page”, but when i remove the parent :

http://localhost/theme/lost-password/, then i can view.

Also i add the shortcode [woocommerce_lost_password] in the “Lost user password” page template.

The problem still remain.

@mike Jolley thanks for your answer. In my case is important to have the best feedback, because these days i am confused and i try to solve.
I delete the page template. Also i make some updates in the code :

<a href="<?php echo esc_url( add_query_arg( array( 'key' => $reset_key, 'login' => rawurlencode( $user_login ) ), wc_get_endpoint_url( 'lost-password', '', wc_get_page_permalink( 'login' ) ) ) ); ?>">
 <?php _e( 'Click here to reset your password', 'woocommerce' ); ?></a>

But redirect me in the same page and not in the lost password page.

Endpoints : Lost Password -> lost-password
url : mytheme/login/lost-password/?login

As permalinks i have :
Common Settings: Custom Structure : /blog/%postname%/
Product permalink base : Default
2nd case : Default all the settings, but the problem still remainning. Not load.

The website is in localhost. What you suggest?

Sorry for the delay. I post again. I have some serious problems and i don’t know the reason.
– I download the default theme of “storefront” and when i activated, “my-account”, “lost password” page, work.
– In my theme, i remove all the functions, templates (custom pages), WooCommerce folder with overriding files and inside i let only the basic files like index, css. But the problem still remaining.

What i am doing wrong?